快时变多用户MIMO-OFDM系统中复杂度可调的子载波分组预编码技术  

Grouped-Subcarrier Precoder with Adjustable Complexity for MultiUser MIMO-OFDM Systems in Time-Variant Wireless Channels

作　　者：童娟娟 束锋[1,2,3] 李隽[1] 李蠡[1] 王忆蒙 桂林卿[1] 陆锦辉[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094 [2]东南大学移动通信国家重点实验室,南京210096 [3]南京理工大学近程高速目标探测技术国防重点学科实验室,南京210094

出　　处：《电子器件》2016年第1期41-45,共5页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(61271230;61472190);中央高校基本科研业务费专项资金项目(30920130122004);东南大学移动通信国家重点实验室开放课题项目(2013D02)

摘　　要：在时变多用户MIMO-OFDM系统中,所有子载波整体预编码方案的性能优于单个子载波单独预编码方案。然而前者的复杂度是基站发射天线数J与子载波总数N乘积的函数,显著高于后者,特别NJ>1000时,复杂度极高。为了解决这个问题,我们提出了一种基于最大化信泄噪比的复杂度可调的分组子载波GS-Max-SLNR(Grouped-Subcarrier Maximum Signal-toLeakage-and-Noise Ratio)预编码方案。此外,我们推导了组间干扰公式,该公式在给定多普勒频移和信噪比的条件下,可以根据需要选取合适的分组数。理论建模和仿真表明,通过选取合适的分组数目,提出的GS-Max-SLNR能够实现复杂度和性能的良好折中。In multi-user time-variant MIMO-OFDM system,the global beamformer of precoding all subchannels to gether performs far better than the one of precoding each subcarrier individually. However,the complexity of the for-mer becomes prohibitive as the product of the number of transmit antennas at base-station and the total number of subcarriers increases up to or more than one thousand. To solve this problem,a grouped-subcarrier maximum signal-to-leakage-and-noise ratio（GS-Max-SLNR）precoder with adjustable complexity is proposed. Using theoretical mod-eling and simulations it is found that the proposed GS-Max-SLNR precoder can strike a good balance between complexity and performance by choosing a proper value of group number. It is noted that the idea of grouping can be easily extended to other classic precoders like block diagonalization,and minimum mean square error. Additionally,we also derive a simple formula for inter-group interference to help choose the proper number of groups given Doppler spread and signal-to-noise ratio.

关 键 词：多输入多输出 正交频分复用 最大化信泄噪比 子载波分组 线性预编码 

分 类 号：TN919.3[电子电信—通信与信息系统]